[issue37418] Code execution without calling it

[Emilio López Arias]

New submission from Emilio López Arias <milio81 at gmail.com>:

Create a new python file: example.py
------------------------------------
def my_decorator(f):
	print("before")
	f()
	print("after")


@my_decorator
def my_function():
	print("hello world")
------------------------------------

If you execute the file example.py you should see some output you shouldn't:
(base) C:\Users\emilio\curso_python>python --version
Python 3.7.3
(base) C:\Users\emilio\curso_python>python ejemplo.py
before
hello world
after

----------
messages: 346661
nosy: Emilio López Arias
priority: normal
severity: normal
status: open
title: Code execution without calling it
type: security
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37418>
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